ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Triceratops dinosaur. Computer artwork of a Triceratops sp. dinosaur. This large and heavy herbivore inhabited what is now North America between 72 and 65 million years ago, in the late Cretaceous period. It is thought that the three horns on its head and the neck frill were used in defence against predators. They may also have been used in fights between rival males or in mating displays. Triceratops reached a length of over nine metres.
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